Ross Anderson didn't install a bow thruster
in his 45-Plus DUCK (see it at http://dieselducks.com ) Instead,
he went for the "Articulated Rudder" shown here. Ross
can cut donuts with the boat, bringing it into very tight situations
without problems. Of course he also knows what he's doing but
just the same, this rudder idea greatly helps close quarters handling.

The idea appears pretty
simple and reliable. I don't know if things could seize up or
not if the boat sits for 6 months. I'd keep lots of grease on
everything.

Chines Junks used to cut diamond shaped slots
in the rudder. The idea was the water could pass through the rudder
and set up some sort of extra currents which helped turn the ship.
Or maybe it was to relieve pressure on the rudder? I think it
was to help steer. I've always wanted to try the cut-outs but
so far have always chickened out. Maybe one of you will do it
and let us all know how it works!